you should check out the ati 4650.
i don't know if that'll be in your price range, i just know that in the US that's the cheapest "gaming" card you can buy. like, anything cheaper or of less performance wouldn't really be worth it, and it would definitely be better than the 7300 gt. i think the nividia equivalent would be like the 9600 gso.
if that is in your price range and you can afford better, than there's the 4670 and the 9600 gt, and then after that the 5670 and the 9800gt
and if you can't afford that, then i don't really know what to tell you. like i said before, anything less than that would not really be worth the money